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The first term of an arithmetic sequence is  −22 . The common difference of the sequence is 5.

What is the sum of the first 30 terms of the sequence?

 Feb 8, 2020
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Use AP formula to find the sum:

 

Sum = 30/2 * [-22*2  +  5*(30 - 1)]

         = 15 *      [-44  +  5*29 ]

         = 15 *      [-44  +   145  ]

         = 15 *      [101]

         = 1,515

 Feb 8, 2020

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